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NANO LETTERS, Volume: 17, Issue: 8, Pages: 4683-4688

 Revealing Surface Elemental Composition and Dynamic Processes Involved in Facet-Dependent Oxidation of Pt3Co Nanoparticles via in Situ Transmission Electron Microscopy

By:Dai, S (Dai, Sheng)[ 1 ] ; Hou, YS (Hou, Yusheng)[ 2 ] ; Onoue, M (Onoue, Masatoshi)[ 2 ] ; Zhang, SY (Zhang, Shuyi)[ 1,3 ] ; Gao, WP (Gao, Wenpei)[ 1 ] ; Yan, XX(Yan, Xingxu)[ 1 ] ; Graham, GW (Graham, George W.)[ 1,3 ] ; Wu, RQ (Wu, Ruqian)[ 2 ] ; Pan, XQ (Pan, Xiaoqing)[ 1,2 ]

NANO LETTERS, Volume: 17, Issue: 8, Pages: 4683-4688

DOI: 10.1021/acs.nanolett.7b01325

Published: AUG 2017

Document Type:Article

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Abstract

Since catalytic performance of platinum metal (Pt-M) nanoparticles is primarily determined by the chemical and structural configurations of the outermost atomic layers, detailed knowledge of the distribution of Pt and M surface atoms is crucial for the design of Pt-M electrocatalysts with optimum activity. Further, an understanding of how the surface composition and structure of electrocatalysts may be controlled by external means is useful for their efficient production. Here, we report our study of surface composition and the dynamics involved in facet-dependent oxidation of equilibrium-shaped Pt3Co nanoparticles in an initially disordered state via in situ transmission electron microscopy and density functional calculations. In brief, using our advanced in situ gas cell technique, evolution of the surface of the Pt3Co nanoparticles was monitored at the atomic scale during their exposure to an oxygen atmosphere at elevated temperature, and it was found that Co segregation and oxidation take place on {111} surfaces but not on {100} surfaces.

Keywords

Author Keywords:Pt-Co nanoparticlessurface elemental distributionfacet-dependent oxidationin situ TEMgas cell

KeyWords Plus:OXYGEN REDUCTION REACTIONALLOY NANOPARTICLESATOMIC-SCALEENHANCED ACTIVITYPT-COELECTROCATALYSTSSEGREGATIONTRANSITIONNANOCRYSTALSSTABILITY

Author Information

Reprint Address: Pan, XQ (reprint author)


Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92697 USA.

Reprint Address: Pan, XQ (reprint author)


Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA.

 

Addresses:


[ 1 ] Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92697 USA


[ 2 ] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA


[ 3 ] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

 

E-mail Addresses:xiaoqing.pan@uci.edu

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